Anthracene dye.



' zen of the German Empire, residing at El-' UNITED STATES mam OFFICE.

' JOSEPH DEINET, OEELBERFELD; GERMANY,

As S IGNOR TO FARBENFABRIKEN VORM.

FRIEDRL'BAYER & 00., or ELBERFELD, GERMANY, A CORPORATION 'OFGERMANY.

ANTHRACENE DYE.

Specification of Letters Patent.

Patented Dec. a4, 1902.-

' Application filed August 1907- Serial No. 0881694.; l

To all whom it may concern: Be it known that I; J OSEPH DEI'NET, acitiberfeld, Kingdom of Prussia, Germany, have duction of a new dyestuffof series from which a-vat canbe prepared and cotton olive-green vinvented new and useful Improvements 1I1 Anthracene Dyestuff, of whichthe following is a specification.

My present invention relates to the prothe anthracene which dyesunmordanted shades from such avat. The process for its productionconsists in treating a solution of alpha-methylaminoanthraquinone insulfuric acid with metals, e. g. aluminum, copper, silver, or the like.

I In carrying out my process practically I .can proceed as follows,

Weight: 20 parts My,new dyestui'f is a dark greenish-black -none I withaluminum, 4 dark (greenish-black paste soluble 1n concens'ulfuric acidwith a dull violet color;

aste scarcely soluble in or anic solvents. t dissolves in concentratefsulfuric acid with a dull violet ,color. U on' "treatmentwith'analkaline solution of ydrosulfite of sodium, it yields areddish'vat which dyes unmordanted cotton fast oliveegreen sha es Havingnow described my invention and in what manner the sa'me is to beperformed,

what I claim as new, and desire to secure by Letters Patent, is

The herein-described new dyestuff which canjbe obtained by treating asulfuric acid solution of alpha methylaminoanthraquiwhich dyestufi is atrate [and giving a reddish vat with hydrosulfite and caustic soda lye,danted cotton olive-green shades, tially as hereinbefore described.

In testimony whereof I have hereunto set myhand in the presence of twosubscribing witnesses. a

Y JOSEPH DEINET. [L13 Witnesses:

OTTO KoNre, WALTER GREEFF.

which vat dyes unmorsubstan-'

